Respirator filter



FIG. 1 is a perspective view showing the new design for a respirator filter.

FIG. 2 is a front view thereof, the rear view being a mirror image thereof;

FIG. 3 is a left view thereof, the right view being a mirror image thereof; and,

FIG. 4 is a top view thereof, the bottom view being a mirror image thereof.

In the drawings, the broken lines are for the purpose of illustrating environment only and form no part of the claimed design. 

CLAIM The ornamental design for a respirator filter, as shown and described. 